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any of several rod-shaped, anaerobic bacteria of the genus Bacteroides, occurring in the alimentary and genitourinary tracts of humans and other mammals, certain species of which are pathogenic.
Historical Examples

Cultivation and classification of “bacteroides,” “symbionts,” or “rickettsiae” of Blattella germanica.
The Biotic Associations of Cockroaches Louis M. Roth

Bacteroides Bac·te·roi·des (bāk’tə-roi’dēz)
A genus of gram-negative, anaerobic, rod-shaped, non-sporeforming bacteria that occur in the respiratory, intestinal, and urogenital tracts of warm-blooded animals and include some pathogenic species.


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